21222120010 has 128 divisors (see below), whose sum is σ = 50062924800. Its totient is φ = 6424121088.

The previous prime is 21222119957. The next prime is 21222120011. The reversal of 21222120010 is 1002122212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21222120011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1015224 + ... + 1035916.

It is an arithmetic number, because the mean of its divisors is an integer number (391116600).

Almost surely, 2^21222120010 is an apocalyptic number.

21222120010 is an abundant number, since it is smaller than the sum of its proper divisors (28840804790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222120010 is a wasteful number, since it uses less digits than its factorization.

21222120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20757 (or 20743 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21222120010 its reverse (1002122212), we get a palindrome (22224242222).

The spelling of 21222120010 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, ten".